Theoretical investigation of the lattice thermal conductivities of II–IV–V₂ pnictide semiconductors

Posligua, V. ORCID: https://orcid.org/0000-0003-3375-3706, Plata, J. J. ORCID: https://orcid.org/0000-0002-0859-0450, Márquez, A. M. ORCID: https://orcid.org/0000-0001-6699-064X, Sanz, J. F. ORCID: https://orcid.org/0000-0003-2064-7007 and Grau-Crespo, R. ORCID: https://orcid.org/0000-0001-8845-1719 (2023) Theoretical investigation of the lattice thermal conductivities of II–IV–V₂ pnictide semiconductors. ACS Applied Electronic Materials. ISSN 2637-6113 doi: 10.1021/acsaelm.3c01242

Abstract/Summary

Ternary pnictide semiconductors with II–IV–V2 stoichiometry hold potential as cost-effective thermoelectric materials with suitable electronic transport properties, but their lattice thermal conductivities (κ) are typically too high. Insights into their vibrational properties are therefore crucial to finding strategies to reduce κ and achieve improved thermoelectric performance. We present a theoretical exploration of the lattice thermal conductivities for a set of pnictide semiconductors with ABX2 composition (A = Zn, Cd; B = Si, Ge, Sn; and X = P, As) using machine-learning-based regression algorithms to extract force constants from a reduced number of density functional theory simulations and then solving the Boltzmann transport equation for phonons. Our results align well with available experimental data, decreasing the mean absolute error by ∼3 W m–1 K–1 with respect to the best previous set of theoretical predictions. Zn-based ternary pnictides have, on average, more than double the thermal conductivity of the Cd-based compounds. Anisotropic behavior increases with the mass difference between A and B cations, but while the nature of the anion does not affect the structural anisotropy, the thermal conductivity anisotropy is typically higher for arsenides than for phosphides. We identify compounds such as CdGeAs2, for which nanostructuring to an affordable range of particle sizes could lead to κ values low enough for thermoelectric applications.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/114207
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Uncontrolled Keywords	Materials Chemistry, Electrochemistry, Electronic, Optical and Magnetic Materials
Publisher	American Chemical Society (ACS)
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